Those items will help stabilize the rear. The cradle bushings help the IRS feel as part of the car in turns, not follow the cars in turns. Both really helps in autocross that I do a lot of. As to traction I have every part to reduce wheel hop and I don’t seem to have that issue. Traction though? I run RE71R’s 305/30/19 for autocross, I can only leave the start at 1500 rpm to get could bite. Past that no way.
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